Chọn câu đúng:\(\left( {a + b + c - d} \right)\left( {a + b - c + d} \right) = {\left( {a + b} \right)^2} - {\left( {c - d} \right)^2}\)

A. \({\left( {c + d} \right)^2} - {\left( {a - b} \right)^2} = \left( {c + d + a + b} \right)\left( {c + d - a + b} \right)\)

B. \({\left( {c - d} \right)^2} - {\left( {a + b} \right)^2} = \left( {c - d + a + b} \right)\left( {c - d - a + b} \right)\)

C. \(\left( {a + b + c - d} \right)\left( {a + b - c + d} \right) = {\left( {a + b} \right)^2} - {\left( {c - d} \right)^2}\)

D. \(\left( {a + b - c - d} \right)\left( {a - b - c + d} \right) = {\left( {a + b} \right)^2} - {\left( {c - d} \right)^2}\)